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Display screen having light-emitting diodes

Active Publication Date: 2020-11-19
ALEDIA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a display screen that uses light-emitting diodes (LEDs) to overcome the limitations of existing LED display screens. The screen includes control circuits that use pulse-width modulation to control the current source powering the LEDs. The display pixels are smaller than 200 μm, and the screen also includes first electrodes, a circuit for supplying a selecting signal, and at least two oscillating circuits capable of supplying non-synchronous periodic signals. The screen can have a thousand display circuits and each oscillating circuit is coupled to less than one hundred control circuits. The frequency of each periodic signal is greater than the frequency of the selection signal on one of the first electrodes. The technical effects of this patent include improved image quality, reduced power consumption, and improved control of the LED current.

Problems solved by technology

This causes a decrease in the space available to form the display pixel control circuits.
A disadvantage is that control circuits implementing a pulse-width modulation generally occupy more space than other types of control circuits.

Method used

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Examples

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Embodiment Construction

[0026]The same elements have been designated with the same reference numerals in the various drawings and, further, the various drawings are not to scale. For clarity, only those steps and elements which are useful to the understanding of the described embodiments have been shown and are detailed. The terms “approximately”, “substantially”, “about”, and “in the order of” are used herein to designate a tolerance of plus or minus 10%, preferably of plus or minus 5%, of the value in question.

[0027]Further, a signal which alternates between a first constant state, for example, a low state, noted “0”, and a second constant state, for example, a high state, noted “1”, is called a “binary signal”. The high and low states of different binary signals of a same electronic circuit may be different. In particular, the binary signals may correspond to voltages or to currents which may not be perfectly constant in the high or low state. Further, in the following description, the source and the dr...

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Abstract

A display screen including display circuits, each display circuit including a light-emitting diode, a controllable current source powering the light-emitting diode, and a control circuit capable of supplying a pulse-width modulated signal for controlling the current source from a periodic signal. The display screen further includes first electrodes coupled to the control circuits, a circuit for supplying a selection signal successively on each first electrode, and an oscillating circuit or oscillating circuits capable of supplying the periodic signals, the periodic signals being non-synchronous with the display circuit selection signals.

Description

[0001]The present patent application claims the priority benefit of French patent application FR17 / 63313 which is herein incorporated by reference.BACKGROUND[0002]The present disclosure relates to a display screen having its display pixels comprising light-emitting diodes, whatever their type of technology (2D, 3D light-emitting diode, organic light-emitting diode, etc.).DISCUSSION OF THE RELATED ART[0003]The display pixels of a display screen comprising light-emitting diodes may comprise, for each display pixel, a circuit for controlling the light-emitting diode or the light-emitting diodes of the display pixel.[0004]It is known to control a light-emitting diode by pulse-width modulation, also called PWM. This type of control comprises conducting successive constant current pulses through the light-emitting diode, the pulses being cyclically repeated, the duty cycle determining the light intensity emitted by the light-emitting diode. Such a control advantageously enables to operate...

Claims

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Application Information

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IPC IPC(8): G09G3/32
CPCG09G2320/064G09G2300/0861G09G3/32G09G3/2014G09G3/3233G09G3/3291G09G2300/0809G09G2300/0842G09G2330/025
Inventor CHARBONNIER, MATTHIEUMERCIER, FRÉDÉRIC
Owner ALEDIA
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